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Zhiyou Zhou,Yiyan Luo,Shuaiying Peng,Qinghua Zhang,Zhi Li,Hanguang Li 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.2
To obtain native strains to efficiently use puerariae slag (PS) hydrolysate and resistant butanol toxicity, a self-designed isolation method was adopted. With this effort, the strain YBS3 was obtained. Based on 16S rDNA comparison, the strain YBS3 was identified as Clostridium beijerinckii. The feasibility of using PS hydrolysate as substrate to produce butanol was evaluated. A significant phase shift delay was encountered in acetonebutanol- ethanol (ABE) fermentation process, and then leaded to low production and productivity of butanol. However, when the C/N ratio regulation strategy was performed at mid-logarithmic phase, the problem of the phase shift delay was smoothly solved and the yield and productivity of butanol was improved. Specifically, the final production and productivity of butanol were 9.75 ± 0.14 g/L and 0.18 g/(L·h), respectively, which was 46.40% and 125.00% higher than without C/N ratio regulation. This study confirms that the accelerating phase shift is a convenient but effective approach, thereby is a promising technology for improving ABE fermentation performance.
Simultaneous optimization of water and heat exchange networks
Zhiyou Chen,Jingtao Wang,Yanlong Hou,Xiaoduan Li 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.4
This paper focuses on the simultaneous optimization of the heat-integrated water allocation networks. Amathematic model is established to illustrate the modified state-space representation of this problem. An easy logicalmethod is employed to help identify the streams of hot or cold ones. In this model, the water exchange networks (WEN),heat exchange networks (HEN), and the interactions between the WEN and HEN combine together as one unity. Thus,the whole network can be solved at one time, which enhances the possibility to get a global optimal result. Examplesfrom the literature and a PVC plant are analyzed to illustrate the accuracy and applicability of this method.
Fang Liu,Kechao Zhou,Zhiyou Li 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.5
Hydroxyapatite/β-calcium phosphate coatings with a high bonding strength on titanium substrates were prepared by electrodeposited-hydrothermal synthesis and calcination. The phase composition, microstructure and bonding strength of the coatings were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and mechanical testing. It showed that electro-deposition coating phase mainly consisted of dicalcium phosphate dehydrate and hydroxyapatite. A single hydroxyapatite phase coating was obtained after a hydrothermal treatment for four hours in a solution of ammonia with a pH value above 12. After calcination below 700 oC, the phase composition of the coating remained the single hydroxyapatite phase. Then the β calcium phosphate phase appeared when the calcination temperature was above 800 oC. The quantity of β calcium phosphate could be controlled by adjusting the calcination parameters. For the specimens not pre-treated, calcination in air was beneficial to improve the bonding strength below 700 oC. Above 800 oC, the bonding strength decreased obviously because of the appearance of a loose and thick titanium nitride and titanium dioxide transition layer. The highest bonding strength in this study was obtained on the specimens pre-treated in a sodium hydroxide solution and calcined in an argon atmosphere at 900 oC.
Ordered porous TiO2 films obtained by freezing and the application in dye sensitized solar cells
Xingxing Wang,Bingchu Yang,Kechao Zhou,Dou Zhang,Zhiyou Li,Conghua Zhou 한국물리학회 2015 Current Applied Physics Vol.15 No.5
TiO2 films with ordered porous structure were prepared by freezing. By simply freezing wet TiO2 film on a cold copper plate, ice crystals could grow from bottom of film. Removing such ice crystals then led to ordered, micro-sized pores in the films. With assistance of scanning electron microscopy and N2 adsorptionedesorption isotherms, micro-structural properties of the films were studied. Coarsening behavior of ice crystals was analyzed based on evolvement of the micro-structure. It was found that, both larger film thickness and longer freezing time were beneficial for the formation of ordered porous structure, which was caused by enhanced ice crystals growth. The films were then used to fabricate photoanode of dye sensitized solar cells, of which the photo-to-electric power conversion efficiency was evaluated. It was observed that, solar cell made of ordered porous TiO2 film came out with 13% larger photo-current density comparing to that made of conventional doctor blading method, which is due to the enhanced light scattering by the ordered porous structure.
Guojia Fang,Haoning Wang,Hao Long,Zhao Chen,Xiaoming Mo,Songzhan Li,Zhiyou Zhong 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.4
Alternating-current-driven ZnO-based light-emitting diodes (LEDs) with an Au/ZnMgO/ZnO/ZnMgO/GaN/In structure have been fabricated. Both polarity-controlled electroluminescence (EL) and ultraviolet emission were achieved when driven by an alternating current (AC) under a much lower root-mean-square voltage than that of conventional inorganic AC thin-film electroluminescent devices. This ZnO-based LED can be regarded as a series incorporating a metal-insulator-semiconductor diode and a p-i-n diode. The EL mechanisms were discussed in terms of the band diagrams and carrier transport behavior with reference to the semiconductor heterojunction theory.